1 Features

• 90% High Efficiency Switch Mode 2-A Charger

• 3.9-V to 6.2-V Single Input USB-Compliant

Charger with 6.4-V Over-Voltage Protection

– Input voltage and current limit supports USB

2.0 and USB 3.0

– Input Current Limit: 100 mA, 150 mA, 500 mA,

900 mA, 1 A, 1.5 A, 2 A

• USB OTG with Adjustable output 4.55 V to 5.5 V

at 1 A or 1.5 A

– Fast OTG Startup (22 ms Typical)

– 90% 5-V Boost Mode Efficiency

– Accurate ±15% Hiccup Mode Overcurrent

Protection

• Narrow VDC (NVDC) Power Path Management

– Instant System On with No Battery or Deeply

Discharged Battery

– Ideal Diode Operation in Battery Supplement

Mode

• 1.5-MHz Switching Frequency for Low Profile 1.2-

mm Inductor

• I2C port for optimal system performance and

status reporting

• Autonomous Battery Charging with or without

Host Management

– Battery Charge Enable

– Battery Charge Preconditioning

– Charge Termination and Recharge

• High Accuracy

– ±0.5% Charge Voltage Regulation

– ±7% Charge Current Regulation

– ±7.5% Input Current Regulation

– ±3% Output Voltage Regulation in USB OTG

Boost Mode

• High Integration

– Power Path Management

– Synchronous Switching MOSFETs

– Integrated Current Sensing

– Bootstrap Diode

– Internal Loop Compensation

• Safety

– Battery Temperature Sensing for Charging and

Discharging in OTG Mode

– Battery Charging Safety Timer

– Thermal Regulation and Thermal Shutdown

– Input and System Over-Voltage Protection

– MOSFET Over-Current Protection

• Charge Status Outputs for LED or Host Processor

• Maximum power tracking capability by input

voltage regulation

• 20-μA Low Battery Leakage Current and Support

Shipping Mode

• 4-mm x 4-mm VQFN-24 Package

2 Applications

• Tablet PC, Smart Phone, Internet Devices

• Portable Audio Speaker

3 Description

The bq24259 is a highly-integrated switch-mode

battery charge management and system power path

management device for 1 cell Li-Ion and Li-polymer

battery in a wide range of smart phone and tablet

applications. Its low impedance power path optimizes

switch-mode operation efficiency, reduces battery

charging time and extends battery life during

discharging phase. The I2C serial interface with

charging and system settings makes the device a

truly flexible solution.